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Biology I

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Term
Definition
Cell Cycle   Is the regular pattern of growth, DNA duplication, and cell division that occurs in eukaryotic cells  
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Mitosis   Is the division of the cell nucleus and its contents.  
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Cytokinesis   Is the process that divides the cell cytoplasm.  
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Chromosomes   Is one long continuous thread of DNA that consists of numerous genes along with regulatory information.  
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Histones   At almost all times during the cell cycle, each of your chromosomes is associated with a group of proteins.  
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Chromatin   At this stage--the "spaghetti" stage-- the loose combination of DNA and proteins.  
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Chromatid   One half of a duplicated chromosome.  
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Centromere   A region of the condensed chromosomes that looks pinched.  
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Telomeres   Which are made of repeating nucleotides that do not form genes.  
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Prophase   Chromatin condenses into tightly coiled chromosomes.  
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Metaphase   The spindle fibers attach to a protein structure on the centromere of each chromosome and align the chromosomes along the cell equator, around the middle of the cell.  
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Anaphase   Sister chromatids separate from each other.  
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Telophase   A complete set of identical chromosomes is positioned at each pole of the cell.  
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Somatic cells   Also called body cells, make up most of your body tissues and organs.  
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Gametes   Are sex cells-- ova, or eggs, in the female, and the spermatozoa, or sperm cells, in the male.  
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Homologous Chromosomes   Are two chromosomes-- one inherited from the mother, one from the father-- that have the same length and general appearance.  
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Autosomes   Chromosomes that contain genes for characteristics not directly related to the sex of the organism.  
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Sex chromosomes   That directly control the development of sexual characteristics.  
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Sexual reproduction   Involves the fusion of two gametes that results in off-spring that are a genetic mixture of the both parents.  
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Fertilization   The actual fusion of an egg and a sperm cell.  
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Diploid   Means a cell has two copies of each chromosome: one copy from the mother, and one from father.  
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Haploid   Means that a cell only has one copy of each chromosome.  
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Meiosis   Is a form of nuclear division that divides a diploid cell into haploid cells.  
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Gametogenesis   Is the production of gametes.  
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Sperm   The male gamete.  
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Egg   The female gamete.  
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Polar bodies   Cells with little more than DNA that are eventually broken down.  
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Traits   Are distinguishing characteristics that are inherited, such as eye color, leaf shape, and tail length. etc.  
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Genetics   Is the study of biological inheritance patterns and variation in organisms.  
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Purebred   If a lone of plants has self-pollinated for long enough, that line becomes genetically uniform.  
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Cross   In genetics, the mating of two organisms.  
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Law of segregation   Organisms inherit two copies of each gene, one from each parent. Organisms donate only one copy of each gene in their gametes. Thus, the two copies of each gene segregate, or separate, during gamete formation.  
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Bacteriophage   Or "phage" for short, takes over a bacterium's genetic machinery and directs it to make more viruses.  
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Nucleotides   The small units, or monomers, that make up DNA  
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Double helix   In which two strands of DNA wind around each other like a twisted ladder.  
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Base Pairing Rules   Thymine (T) always pairs with Adenine (A), and Cytosine (C) always pair with Guanine (G)  
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Replication   This process by which DNA is copied during the Cell Cycle.  
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DNA polymerases   A group of enzymes that bond together new nucleotides together.  
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